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Strength and thermal behavior of low weight foam geopolymer using circulating fluidized bed combustion fly ash

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Abstract

A comparative study of the influence of elevated temperature on foam geopolymer using circulating fluidized bed combustion fly ash (CFA) was reported. Foam geopoymers were prepared with different amounts of foam agent and different SiO2/Al2O3 molar ratios of 3.1, 3.4, and 3.8. The mechanical, thermo-physical properties and microstructure of the foam geopolymers before and after exposure to elevated temperature of 800, 1000, and 1200 °C were investigated. The specimen with SiO2/Al2O3 molar ratio of 3.8 exhibits the highest compressive strength, better microstructure and dimension stability before and after firing. Carnegeite, nepheline, and zeolite crystalline phases appearing after exposure may contribute to the good post-exposure strength. Low weight foam geopolymer using CFA can increase strength and maintain higher stability as high as 1000 °C.

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Authors and Affiliations

  1. Research Institution of Concrete and Eco-materials, School of Chemical and Environmental Engineering, China University of Mining & Technology, Beijing, 100083, China

    Ze Liu  (刘泽), Ning-ning Shao  (邵宁宁), Jun-feng Qin  (秦俊峰), Fan-long Kong  (孔凡龙), Chun-xue Wang  (王春雪) & Dong-min Wang  (王栋民)

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  1. Ze Liu  (刘泽)
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  2. Ning-ning Shao  (邵宁宁)
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  3. Jun-feng Qin  (秦俊峰)
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  4. Fan-long Kong  (孔凡龙)
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  5. Chun-xue Wang  (王春雪)
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  6. Dong-min Wang  (王栋民)
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Correspondence to Ze Liu  (刘泽).

Additional information

Foundation item: Project(20120023110011) supported by Doctoral Program of Higher Education of China; Projects(2009KH09, 2009QH02) supported by the Fundamental Research Funds for the Central Universities of China

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Liu, Z., Shao, Nn., Qin, Jf. et al. Strength and thermal behavior of low weight foam geopolymer using circulating fluidized bed combustion fly ash. J. Cent. South Univ. 22, 3633–3640 (2015). https://doi.org/10.1007/s11771-015-2904-0

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  • DOI: https://doi.org/10.1007/s11771-015-2904-0

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